*{
	margin: 0; 
	padding: 0;
	box-sizing: border-box;
}
a{
	text-decoration: none;
	display: inline-block;
}
header{
	/*width: 100%;
	height: 491px;*/
	background: #50abd7;
}
.container::after,
.banner::after{
	clear: both;
	display: table;
	content: "";
}
.container{
	width: 870px;
	margin: auto;
}
nav{
	/*height: 59px;*/
	padding-top: 11px;
	padding-bottom: 11px;
}
nav .nav-left,
nav .nav-center,
nav .nav-right{
	float: left;
	width: 33.333%;
}
nav .nav-left{
	height: 33px;
	
}
nav .nav-center{
	text-align: center;
	
}
nav .nav-right{
	text-align: right;
}
nav .nav-right a{
	color: #fff;
	font-size: 12px;
	font-weight: bold;
}
nav .nav-right a img{
	display: none;
}
.banner{
	margin-top: 60px;
	color: #FFFFFF;
}
.banner .col{
	width: 50%;
	float: left;
}
.banner p{
	font-weight: bold;
}
.banner h1{
	font-weight: 300;
	margin-bottom: 25px;
	font-size: 36px;
}
.banner a{
	background: #2996cc;
	padding: 15px 53px;
	font-weight: bold;
	color: #fff;
	font-size: 12px;
	border-right: 2px;
	transition: 0.5s;
}
.banner a:hover{
	background: #1882b7;
}
.banner img{
	width: 100%;
	display: block;
}
main{
	margin-bottom: 60px;
}
main .col{
	margin-top: 60px;
	width: 25%;
	float: left;
	text-align: center;
	padding: 0 10px;
}
main img{
	margin-bottom: 10px;
}
main h3{
	font-size: 14px;
	margin-bottom: 10px;
}
main p{
	font-size: 14px;
	color: #657082;
}
.download{
	width: 870px;
	margin: auto;
	border-top: 1px solid #e0e0e0;
	text-align: center;
	margin-top: 65px;
	margin-bottom: 65px;
	padding-top: 65px;
}
.download h2{
	margin-bottom: 20px;
}
.download p{
	margin-bottom: 35px;
}
.download img{
	width: 120px;
	padding: 5px;
}
footer{
	background: #1b2126;
	color: #6a777d;
	padding-top: 60px;
	padding-bottom: 60px;
}
/*响应式代码*/
@media  (max-width:600px ) {
	.container{
		width: 100%;
	}
	.nav-right   span{
		display: none;
	}
	nav .nav-right a img{
		display: inline-block;
		margin-right: 30px;
}
	.banner .col{
		width: 100%;
		text-align: center;
	}
	.banner a{
		margin-bottom: 30px;
	}
	.banner img{
		width: 80%;
	}
	main .col{
		width: 100%;
		padding-left: 10%;
		padding-right: 10%;
	}
	.download{
		width: 100%;
		padding-left: 10%;
		padding-right: 10%;
	}
}